SIMPLE PRESENT
Affirmative
- I cost
- you cost
- she/he/it costs
- we cost
- you cost
- they cost
Negative
- I do not cost
- you do not cost
- she/he/it does not cost
- we do not cost
- you do not cost
- they do not cost
Interrogative
- do I cost ?
- do you cost ?
- does she/he/it cost ?
- do we cost ?
- do you cost ?
- do they cost ?
Negative - Interrogative
- do I not cost ?
- do you not cost ?
- does she/he/it not cost ?
- do we not cost ?
- do you not cost ?
- do they not cost ?
PRESENT CONTINUOUS
Affirmative
- I am costing
- you are costing
- she/he/it is costing
- we are costing
- you are costing
- they are costing
Negative
- I am not costing
- you are not costing
- she/he/it is not costing
- we are not costing
- you are not costing
- they are not costing
Interrogative
- am I costing ?
- are you costing ?
- is she/he/it costing ?
- are we costing ?
- are you costing ?
- are they costing ?
Negative - Interrogative
- am I not costing ?
- are you not costing ?
- is she/he/it not costing ?
- are we not costing ?
- are you not costing ?
- are they not costing ?
SIMPLE PAST
Affirmative
- I cost
- you cost
- she/he/it cost
- we cost
- you cost
- they cost
Negative
- I did not cost
- you did not cost
- she/he/it did not cost
- we did not cost
- you did not cost
- they did not cost
Interrogative
- did I cost ?
- did you cost ?
- did she/he/it cost ?
- did we cost ?
- did you cost ?
- did they cost ?
Negative - Interrogative
- did I not cost ?
- did you not cost ?
- did she/he/it not cost ?
- did we not cost ?
- did you not cost ?
- did they not cost ?
PRESENT PERFECT
Affirmative
- I have cost
- you have cost
- she/he/it has cost
- we have cost
- you have cost
- they have cost
Negative
- I have not cost
- you have not cost
- she/he/it has not cost
- we have not cost
- you have not cost
- they have not cost
Interrogative
- have I cost ?
- have you cost ?
- has she/he/it cost ?
- have we cost ?
- have you cost ?
- have they cost ?
Negative - Interrogative
- have I not cost ?
- have you not cost ?
- has she/he/it not cost ?
- have we not cost ?
- have you not cost ?
- have they not cost ?
PAST CONTINUOUS
Affirmative
- I was costing
- you were costing
- she/he/it was costing
- we were costing
- you were costing
- they were costing
Negative
- I was not costing
- you were not costing
- she/he/it was not costing
- you were not costing
- you were not costing
- they were not costing
Interrogative
- was I costing ?
- were you costing ?
- was she/he/it costing ?
- were we costing ?
- were you costing ?
- were they costing ?
Negative - Interrogative
- was I not costing ?
- were you not costing ?
- was she/he/it not costing ?
- were we not costing ?
- were you not costing ?
- were they not costing ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been costing
- you have been costing
- she/he/it has been costing
- we have been costing
- you have been costing
- they have been costing
Negative
- I have not been costing
- you have not been costing
- she/he/it has not been costing
- we have not been costing
- you have not been costing
- they have not been costing
Interrogative
- have I been costing ?
- have you been costing ?
- has she/he/it been costing ?
- have we been costing ?
- have you been costing ?
- have they been costing ?
Negative - Interrogative
- have I not been costing ?
- have you not been costing ?
- has she/he/it not been costing ?
- have we not been costing ?
- have you not been costing ?
- have they not been costing ?
PAST PERFECT
Affirmative
- I had cost
- you had cost
- she/he/it had cost
- we had cost
- you had cost
- they had cost
Negative
- I had not cost
- you had not cost
- she/he/it had not cost
- we had not cost
- you had not cost
- they had not cost
Interrogative
- had I cost ?
- had you cost ?
- had she/he/it cost ?
- had we cost ?
- had you cost ?
- had they cost ?
Negative - Interrogative
- had I not cost ?
- had you not cost ?
- had she/he/it not cost ?
- had we not cost ?
- had you not cost ?
- had they not cost ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been costing
- you had been costing
- she/he/it had been costing
- we had been costing
- you had been costing
- they had been costing
Negative
- I had not been costing
- you had not been costing
- she/he/it had not been costing
- we had not been costing
- you had not been costing
- they had not been costing
Interrogative
- had I been costing ?
- had you been costing ?
- had she/he/it been costing ?
- had we been costing ?
- had you been costing ?
- had they been costing ?
Negative - Interrogative
- had I not been costing ?
- had you not been costing ?
- had she/he/it not been costing ?
- had we not been costing ?
- had you not been costing ?
- had they not been costing ?